After reading around a lot, and just ending up in circles, I have shed some light at the end of the tunnel on the subwoofer issue.
Firstly, you will need to determine which sound card codec you are using; I am assuming ALC268, as we are dealing with the Acer 7720 series,
which returned this for me.
cat /proc/asound/card0/codec#* | grep Codec
You will then need to check out this link here which will tell you of the sound options to use in the alsa-base configuration file. Find your codec number, e.g. ALC268.
Codec: Realtek ALC268
Codec: Conexant ID 2c06
Open up a terminal and type in
Scroll to the bottom and add the following lines,
sudo gedit /etc/modprobe.d/alsa-base
Repalcing MODEL with the model from the list on the link provided above. It appears that using model=auto gives the best results, as new options appear in the Volume Control and Volume Preferences.
options snd-hda-intel model=MODEL
I hope this brings us closer to solving the subwoofer issue!
825 3stack 3-stack model
826 toshiba Toshiba A205
827 acer Acer laptops
828 dell Dell OEM laptops (Vostro 1200)
829 test for testing/debugging purpose, almost all controls can
830 adjusted. Appearing only when compiled with
832 auto auto-config reading BIOS (default)